I just made this post on [email protected] and thought it would also fit here :)
I made an adapter for standard glass bottles to grow lettuce and herbs in them hydroponically.
This print takes just a few minutes (designed for vase mode!) and you can use up your last inches of filament with it.
https://www.printables.com/model/1002248-hydroponic-kratky-bottle-adapter-vase-mode-ultrafa
Tbh, looks like lots of (wasted?) filament.
I have something similar. My 3" net cups fit perfectly into many used pickle jars.
You can coat them with acrylic color and/ or put some rope around.
They do use a good bit of filament, but I really like the look of them. I’m a bit of a sucker for geometric designs.